Rip Off updated to v1.1

I discovered a “serious” bug in Rip Off, and a few minor
ones too, so I fixed those and made a few tweaks as well.

Version 1.1 is now uploaded.

Changes:
* Difficulty didn’t work as it should, so it didn’t get harder each round as it should have. Fixed.
* Score fixed. Game only showed 4 digits ingame but has been changed to 5 now.
* The places the enemies entered the screen wasn’t random enough.
* Now you get double score if you shoot an enemy with a fuelcell on tow.
* Now it’ll also say, on the score screen, what round you reached in the last game.

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